Second is a quick survey of a neat secret-show series happening on the rooftop of the Hollywood Tower apartment complex. Bands like Mumford & Sons, TV on the Radio and Foster the People have played sets to no more than a few dozen people on the French-Norman castle rooftop, booked as an amenity for residents and sponsored by the rock station 98.7 FM. Florence & the Machine drops by on June 14, but if you want to go, the only ways in are to win a station contest -- or sign a lease.